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Any suggestions to fake the appearance? Think of distorting background images, for 2d video game purposes. And it doesn't have to be very accurate, just a general resemblance.

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At least there's a simple equation [0] for the deflection of light rays caused by a black hole. If your background is a UV map (for example), then it should be easy to compute the distortion effect. rantonels (whose raytracer was the source of inspiration for mine) has done a realtime version [1] -- I believe this should be close to what you're talking about.

[0] https://en.wikipedia.org/wiki/Gravitational_lens#Explanation... [1] http://spiro.fisica.unipd.it/~antonell/schwarzschild/

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